DTC 11

DTC 11 ABS Warning Lamp Circuit Malfunction:

Circuit Description:

This DTC checks the state of the amber ABS warning lamp to identify a situation in which the driver could not be warned of a system malfunction by the amber ABS warning lamp, or the warning lamp is always "ON." The ABS Lamp Driver Module (LDM) turns the amber ABS warning lamp "ON," unless the EBCM provides ground to turn it "OFF." Because of the circuitry in the LDM, only external malfunctions can be detected. As a result, the amber ABS warning lamp itself is not diagnosable, only the control line to the EBCM can be diagnosed. In the event of an open CKT 852, the amber ABS warning lamp will be "ON" at all times, due to the loss of ground at the LDM input. If the control line is shorted to ground, the amber ABS warning lamp is kept "OFF" due to the LDM input being grounded.

DTC Will Set When:

DTC 11 can be set only during the three second bulb check or when the amber ABS warning lamp is commanded "ON." If the EBCM cannot control the amber ABS warning lamp for two seconds, a malfunction exists.

Action Taken:

A malfunction DTC is stored, however, ABS is not disabled.

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Determines if the ABS warning lamp can be properly controlled.
2. Determines if the ABS warning lamp is "ON" constantly.
3. Checks for other DTCs which could turn on the ABS warning lamp.
4. Determines if the ABS warning lamp can be turned "OFF" manually.
5. Checks the integrity of the ABS warning lamp circuitry.
6. Checks for a short to voltage on the ABS warning lamp circuitry.
7. Determines if a malfunctioning EBCM is the cause of DTC 11.
8. Verifies that the other I/P indicator lamps function properly.
9. Determines if the ABS warning lamp can be turned "ON" manually.
10. Checks for a short to ground in the ABS warning lamp circuitry.
11. Checks for a open between "GAUGES" fuse and LDM.
12. Verifies condition of the 7.5 amp "GAUGES" Fuse.
13. Determines if DTC 11 was set due to an EBCM malfunction.

Diagnostic Aids:

An "Intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

The lamp test function of the Tech 1 may be used to command the lamp "ON" while looking for an intermittent malfunction in the ABS warning lamp circuitry.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the Tech 1.

Any circuitry that is suspected as causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.